Listing adding machine



.A 4, 1942. e. c. CHASE LISTING ADDIN G MACHINE Filed Aug. 30, 1940 3Sheets-rSheet l Aug. 4, I942.

G. C. CHASE LISTING ADDING MACHINE Filed Aug. 30, 1940 3 Sheets-Sheet 21942- G. c. CHASE LISTING ADDING MACHINE 3 Sheets-Sheet 3 Filed Aug. 30,1940 lllllll. A WE VENTOR George 55 Y Q TTQRNEY enemas Aug. 4, 1942LES'EHNG ADDING MACHINE George (3. (Chase, South @range, N. .20.,assignor to Monroe Calculating Machine C mpany Orange, N. 5.. acorporation oi Delaware Application August to, rare, Serial No. 354.12%

(Cl. assee) 12 (Claims.

The invention relates to adding or adding and listing machines, and moreparticularly to total taking mechanism therefor.

In taking a total from accumulators equipped with crawl tens transfergearing it has been customary to rotate the accumulator wheelssuccessively to zero, beginning with the right hand or lower orderwheel. One object of this was to subtract any partial tens transfer froma wheel before attempting to adjust a stop into the path of movement ofthe zero stop on the wheel, since there is no practical way todistinguish between a wheel standing at registering position and one at9.9, as would be necessary in adjusting the stop into position at oneside or the other of the zero stop. Also, the successive zeroizingeliminated certain cramping actions set up in the tens transfer gearingby the spring driven actuator segments.

According to the present invention the accumulator wheels (equipped withcrawl tens transfer gearing) are rotated simultaneously to zero in totaltaking, the first stated objection being overcome by the provision ofpreliminary aligning means, whereby the wheels are rotated to counteractany excessive partial tens transfer in the accumulator. The crampingaction is eliminated by the omission of the actuator segment springs,the actuators being positively driven.

The invention'consists in the novel construction and combination ofparts, as set forth in the appended claims.

In the accompanying drawings, illustrating the invention,

Fig. 1 is a right side elevation of the value entering, differentialactuator and accumulating means of an adding machine constructed inaccordance with the invention.

Fig. 2 is a front elevation of parts seen in Fig. 1.

Fig. 3 is a detail right'side elevation of the differential actuatordrive.

Fig. 4 is a right side elevation of the total and subtotal initiatingdevices. I

Fig. 5 is a detail right side elevation of parts shown in Fig. 1, inpositions taken during alignment of an accumulator.

Fig. 6 is an exploded perspective view of the aligning or crawl transfercounteracting devices.

In these drawings the invention is shown as applied to an adding-listingmachine similar to that disclosed in United States Patent No. 1,867,-002, issued to Clyde'Gardner on July 12, 1932, and employing the crawltens transfer means of United States Patent No. 1,828,180, issued toClyde Gardner on October 20, 1931. The positive actuation means employedis of the general type disclosed in United States Patent No. 1,202,800.issued to Thomas Carroll on October 31, 1916. The machine may be handoperated, as in the above noted patents, or it may be operated by anelectric motor, as disclosed in United States Patent No. 1,932,013,issued to Loring P. Crosman on October 24, 1933.

Accumulation Amounts set up in the keyboard 2W are regis-= tered in oneor more accumulators M8 and are set up in the'type bars Bit by means ofdif ferential actuators consisting in each denomina= tional order of twolevers Gill and 5053 (Figs. 1 and 2) having toothed segments engagingop= posite sides of a pinion Edi.

Each lever 6W is provided with a toothed seg ment with which the pinions412 of any one or more of a series of accumulators 413 may be engaged,by movement of the accumulator shafts 403. Each lever 610 is alsoconnected with a type bar 6i i, and with a stop bar GIB cooperating withthe stem of a depressed key 2|5 to limit the movement imparted to theaccumulators and type bar, in accordance with the key value. Each lever500 is connected with a stop bar 502 which also cooperates with the stemof a depressed key H5 in effecting the desired accumulation. Depressionof a key 215 will lift the related column latch 2H3 out of the path of astop of bar 615, in known manner, the column latches preventingoperation of the levers 610 in columns in which no key is depressed.

The pinions 50! are mounted on a shaft 503, which shaft is oscillatedduring the operation of the machine to give the pinions a fixed degreeof oscillatory movement. Shaft 503 is mounted in a frame 8H5 (Fig. 3)pivoted upon the supporting shaft 608 of the' levers Bill, 500. FrameSIG is provided with rollers 504 engaging cam slots of a pair of plates3l8,(one of which is shciawn in the drawings) fixed upon a rock shaft 30In the operation of the machine shaft 30! is rocked, either by means ofa. hand lever or by power connections, thereby, through cam plate 3I8,oscillating shaft 503 about point 608. During the forward stroke of camplate M8 the levers Gin and 500 will be carried counter-clockwise withthe pinions 5M until the teeth of stop bars H5 and 502 contact with thestem of the depressed key. The teeth of these bars are so arranged withrelation to the key stems that the levers It and 500 will becomplementally operated, the levels Sill being given a movementcorresponding to the value of the depressed key and the lever 690 beinggiven a movement corresponding to the full rearward movement of pinionBill, less the movement of lever till. The full movement imparted bypinion 59! is somewhat greater than the movement of lever Bill inregistering the digit 9. this extra movement being provided for in bar502, which is given a slightly longer movement in engaging each of thekey stems. The purpose of this extra movement will be explained later.In the return stroke of plates Ill, levers Bill and 599 will be movedreversely. against appropriate stops, which will be described inconnection with the total taking mechanism.

As is well known in machines of the present Wi and described in PatentNo. 1,867,002, hereinbefore referred to, addition is performed on agiven accumulator by holding the same disengaged from the actuatorsegments during the first described stroke of the parts, and by engagingthe accumulator with said segments and holding it in engagement duringthe return stroke. Similarly, subtraction is effected by engaging theaccumulator with the segments and holding it engaged during the firststroke and by maintaining it disengaged from the segments during thereturn stroke.

Total taking A total registered on an accumulator "I is set up in thetype bars 8 and printed according to the well known method. That is tosay, the accumulator is engaged with the actuator segments, the columnlatches 2 are all released and the accumulator wheels are rotatedsubtractively to zero, thus setting the accumulated value in the typebars H, wherefrom it is printed. The accumulator is disengaged duringthe return stroke, as in subtractive operations. Sub-totals are taken inthe same manner, except that the accumulators are maintained inengagement with the actuator segments during both strokes of theoperating mechanism, whereby the total, which has been subtracted fromthe accumulator wheels, is added back into the accumulator after theprinting has been effected.

The total key 219, and the sub-total key 218 (Fig. 4) set theaccumulator control devices for the appropriate operation, in the mannerset forth in Patent No. 1,687,002, and also eflect rocking of a ball "I,thereby releasing the column latches. Each of these keys is alsoprovided with a forward extension overlying a pin fixed in the upper endof a spring retracted slide 505, this slide having at its lower end ashoulder adapted to engage a pin fixed in a crank arm 506 of totalsetting shaft 591. Lost motion is provided between this pin andshoulder, in order that the column latches will be released before shaft591 is rocked. Shaft 50'! is provided with a series of cam arms 508(Fig. 1) adapted, in the depression of the total or sub-total key, toact successively upon the arms 509, one of which arms is related to eachdifferential actuator column. In order to insure that all of the camarms 59! are effectively operated the total and sub-total keys willremain unlatched until the key stroke is completed, at which time latch"I will become effective to lock the operated key in fully depressedposition. Upon the free end of each arm "9 is pivoted a link I. having astud engaging the diverging slots of a pair of levers Iii, iii. A springIll normally holds the rear end of link M9 raised, maintaining contactof lever H2 with a fixed stop III. In the normal position of the partsthe slot of lever 5|! extends in the direct line of movement of the studof link BIB, while the slot of lever II is so disposed that forwardmovement of link 5H3 will induce clockwise movement of said lever, asviewed in Fig. 1. Lever ill has pivotal connection with an adjustabletotaling stop ill, having guiding support upon the shaft 608, andprovided with projections related respectively to the differentaccumulators.

An accumulator 419 being moved into engagement with the actuatorsegments, and the total or sub-total key depressed, the series oftotaling stops II will be moved forwardly by levers lll, each intocontact with one of a series of control disks H8, fast upon the wheelsof the accumulator. Each of the disks I! is provided with a notch,standing opposite the tooth of the stop 6|! when the related accumulatorwheel stands in the zero registering position, one wall of this notchbeing extended radially to form a zero stop 451. Preferably theperiphery of disk II is formed as a snail cam, having a uniform dropfrom the high point of the zero stop to the low point at theintersection with the other wall of the notch.

As stated, the accumulator wheels are provided with tens transfermechanism of the crawl type that is to say, each lower order wheel isconnected with the next adJacent higher order wheel by ten-to-one ratiogearing. Assuming that a given accumulator wheel stands at 9 and thatthe next adjacent lower order wheel stands at 8 or 9, it will be obviousthat the actual position of the higher wheel will be 9.8 or 9.9, whichis substantially the 0 position of the wheel. Therefore, as so fardescribed, the tooth of stop Oil might engage the notch of the higherorder cam disk Iii before the accumulator is rotated in which case theaccumulator wheel, the lever ill and the type bar 8 would all remain atzero when shaft 30! is operated. Such an action might be permissible ifpositive zero setting of the accumulator wheels were the onlyrequirement, but would result in an error in operations of total taking,wherein the levers III of the several orders must move in accordancewith the numerical total registered by the accumulator wheels.

The levers 5|! are intended to prevent this erroneous operation, bycounteracting the fractional tens transfer registration in the higherorder accumulator wheel. The slotted connection of levers 5H and 512with link "0 provides for complemental movement of the levers upondepression of the total key. If lever ill is free to move, spring M3will hold lever ill in its normal position and lever III will be rotatedclockwise. If, on the other hand, lever III is held, lever M2 will berotated counter-clockwise. If the movement of lever ill becomesobstructed at any instant during the forward movement of link 5"], theremaining movement of the link will effect a correspondingcounter-clockwise movement of lever III. It will be noted that when thezero stop of a higher order wheel is in position to be erroneouslyengaged by stop III. the lower order wheel will stand at 9, 8 orpossibly '1, and that consequently the totaling stop II in this lowerorder will be prevented from making slot of lever 5H and will therebydisplace lever 5|! counter-clockwise, as viewed in Fig. 1. This willbring lever 5!! into contact with a pin 5!, fixed in the actuatorsegment of the higher order actuator lever 6N, advancing the segment andthereby rotating the higher order accumulator wheel far enough in asubtractive direction so that the tooth of stop H3 cannoterroneouslyenter the notch of the related cam disk 5l5. Ob-

viously, a portion only of the fractional transfer registration need becounteracted, in order to allow the stop 6l3 to engage properly on topof the zero stop tooth. 451. For example, if the four wheels of lowestorder register a total of 9999, these four wheels would stand at 9.999,9.99, 9.9 and 9, from left to right respectively, before the total orsub-total key is depressed, and it will be sufficient if the tens,hundreds and thousands wheels are each successively retracted toapproximately 9.5 during the'depression of the total or the sub-totalkey.

Normally, the difierential actuators of the machine stand locked,because of the normal position stops 5 and 5H and the known locatingmeans for the driving elements. In zeroizing the accumulator wheels itis necessary to the elimination of the partial tens transfer values,either by preliminary alignment or during the zeroizing action proper,that the differential actuator lever 6H} and the complementallyoperatedlevers 509 be operated in opposite direc tions, from normal position.Hence, it is necessary, in zero setting operations, to disable at leastone of the normal position stops, allowing an abnormal movement of therelated lever. If the tooth of stop M3 were allowed to enter the notchof a wheel standing at 9.9, it would be necessary to free lever M sothat it could make .8 or .9 of a step of abnormal (clockwise) movementduring the zero setting operation.

In the present construction fractional advance of the actuator leverGill will rotate pinion M and thereby effect a corresponding retractionof the related actuator lever 500, since shaft 503 is held stationary.To allow for this movement, the normal position stop of each lever 5110,except the lever in the units order, is formed as a lug 5" on anextension of the lower order lever 5l2, so that as lever 5!! isdisplaced counterclockwise through the controlling action of the lowerorder cam disk 5|5 the higher order lever 500 willbe permitted a shortabnormal (clockwise) movement. There is, of course, no occasion forlever 500 of the units order to make this clockwise movement from itsnormal position, soythis lever is provided with the usual fixed normalposition stop.

The accumulator controls having been set for a totaling operation andthe totaling stops H3 engaged with the cam disks 5|5, by the depressionof the total or the sub-total key, shaft 3! will be oscillated and theprinting effected in the usual manner. The operation may be effected byhand or by motor operation, controlled through the total or sub-totalkey in known manner.

During the first stroke. of this operation the actuator levers 500 areto be held locked against counter-clockwise movement until the relatedaccumulator wheels have been rotated subtractively to zero, whereuponthe totaling stops III will prevent further movement of actuator leversIll, and the levers 500 will be released so that they may operate duringthe remainder of the stroke. The locking of levers 509 is efiected bythe extensions of levers 5i2, which are provided with lugs 5l8, eachlying normally out of the path of movement of a shoulder 5i! of therelated actuator lever 500. As previously explained, a lever 5 remainsin its normal position after the depression of the total or sub-totalkey only if the related cam disk 5l5 stands in its zero position.Whenever lever 5|! is moved out of its normal position, 'which iswhenever its related cam disk does not stand at zero, lug 5! will lie inthe path of shoulder 519 so that lever 500 will not be released for freecounter-clockwise movement until cam disk 5l5 has been restored to itszero position.

Theoretically shoulder 519 would extend radially with respect to shaft608, so that, as the related accumulator wheel is rotated toward zero,lever hi2 would hold actuator lever 50!] against counter-clockwisemovement beyond normal position until the totaling stop 6l3 falls intothe zero notch of the cam disk. However, it is desired to effect therelease of actuator lever 500 positively, rather than to rely uponspring 5l3 to pull the totaling stop 6l3 into the zero notch ineffecting the release. Therefore, shoulder 5!!! is set at an' angle,providing for a camming effect upon lever 5l2 during the movement ofshaft 593.

As a result of this action, the tendency of spring 593 to swing levers5H and 5) in a counter-clockwise direction maintaining the relatedtotaling stop 6H3 against the cam disk 5l5 is supplemented by thetendency of shoulder 5!!! to urge lug 5l8 forwardly, which urge becomesa positive driving force when the cam disk 5l5 is arrested in its zeroposition by the abutment of the zero stop tooth 451 with the relatedtooth of the totalizing stop 6l3, arresting further countar-clockwisemovement of lever Gill and consequently positively driving the tooth ofthe totalizing stop into the notch of cam disk 5l5. As

'shoulder 5H3 drives lug 5I8 forwardly, lever 500 may move a shortdistance beyond its normal position in a counter-clockwise directionbefore the cam disk 5l5 of the related numeral wheel has reached zeroposition, thus diverting a certain amount of movement of shaft 503 fromactuator lever Gill. Therefore, as previously stated, the total movementof shaft 503 must be somewhat more than nine steps.

It may be noted that while each pair of levers 5M and 5I2 arecomplementally moved during the depression of the total or sub-total keyas above described, they act in unison during the rotation of theaccumulator wheels toward zero, the two levers of each pair being ineffect one rigid member at that time.

Since the totaling stops H3 engage the notches of cam disks 5l5 when theaccumulator wheels stand at zero at the end of the forward stroke of theparts, it is necessary to remove said stops before the return stroke ofthe drive, so that there shall be no interference with the movement ofthe accumulator wheels in sub-totaling and in other similar operations.The release of totaling stops GB is effected by a cam "51 (Fig. 4)mounted on an arm 3l6 of rock shaft 3!. Cam I61 engages a roller mountedon an arm I65 which is normally spring held in a centralized position.During the forward stroke of the drive arm I" will be rocked clockwise,

as seen in Fig. 4, while in the return stroke the arm will be rockedcounter-clockwise, beyondits normal position, bringing a pin in intocontact with the slide and rocking said slide about its support Hi todisengage the shoulder of the slide from the pin of crank arm 506. Thiswill allow spring 522 (Fig. 1) to rock the cam arms Bill to normalposition, permitting springs M3 to move the links ill rearwardly andreturn the levers 5H and totaling stops M3 to normal position.

The relation of levers Ill and iii! to the parts with which theyfunction may be summarized as follows: Stop 6|! slides forwardly againstcam disk M5. Levers ill and 5|! lie between stop ill and the actuatinglevers 500, Bill of the same order. Lug N8 of lever H2 acts on lever50!:

of that same order, and lug 5i! crosses over stop SI! of the relatedorder and lever Bill of next higher order, and acts on lever 500 of thathigher order. Pin H6 is mounted on the right hand side of lever Bill ofthe higher order, passes under lever 5| i, and is acted on by lever BIZ.

The latch 263 is released in well-known manner during the returnmovement of the operating mechanism, permitting the total or sub-totalkey to resume its normal position.

While the above described mechanism has been set forth as a device fortaking a total or a subtotal in a listing machine, it is apparent thatit is also usable as a zero setting device for a register equipped witha tens transfer mechanism of the crawl type in a non-listing adding orcalculating machine.

Alignment It may be noted that if the column latches 2 are lifted andshaft 501 is rocked, against the Upon release of shaft 501, springs 522would.

cause lugs 5" to cam the levers 500 back to normal position and restorethe accumulator to crawl transfer condition. Such an arrangement wouldcall for a setting back of the higher order wheel a full tenth of a stepfor each unit registered in the lower order wheel (for instance from 9.9to 9 registering position). This, of course, would involve merely thecorrect proportioning of cam disk ill, and would not affect the properoperation of the parts in total making.

I claim:

1. In an adding machine, the combination with an accumulator comprisingwheels provided with zero stops and crawl tens transfer gearing betweensaid wheels, differential actuators including each a power element andprimary and secondary elements complementally driven thereby, eachprimary element having operating connection with an accumulator wheel,and driving means adapted to operate all of the power elementssimultaneously; of means cooperating with the accumulator, actuators anddriving means to take a total, including totaling stops adjustable intothe paths of movement of the zero stops, devices operable to rotate saidwheels to counteract partial tens transfers in the accumulator, andelements adjustable by said devices to control the extent of movement ofthe secondary actuator elements during operation of the drivin 2. In anadding machine, the combination with an accumulator comprising wheelsprovided with zero stops and crawl tens transfer gearing between saidwheels, diflerential actuators including each a power element andprimary and secondary elements complementally driven thereby, eachprimary element having operating connection with an accumulator wheel,and driving means adapted to operate all of the power elementssimultaneously; of means cooperating with the accumulator, actuators anddriving means to take a total, including a total key, totaling stopsyieldably adjustable into the paths of movement of the zero stops,devices controlled by the total key and operable to adjust said stops,cooperating members controlled by the total key and operable uponinterruption of said adjustment by engagement of any totaling stops withthe peripheral faces of the related zero stops to move said primaryelements to counteract partial tens transfers in the accumulator, andelements adjustable by said member to control the extent of movement ofthe secondary actuator elements during operation of the driving means.

3. In an adding machine, the combination with an accumulator comprisingwheels provided with zero stops and crawl tens transfer gearing betweensaid wheels, differential actuators including each a power element andprimary and secondary elements complementally driven thereby, eachprimary element having operating connection with an accumulator wheel,and driving means adapted to operate all of the power elementssimultaneously; of means cooperating with the accumulator, actuators anddriving means to take a total, including totaling stops adjustable intothe paths of movement of the zero stops, devices operable to rotate saidwheels to counteract partial tens transfers in the accumulator, andmeans cooperating with said devices, to lock the secondary actuatorelements against operation by the driving means, said locking meansbeing adapted to release each secondary actuator element upon contact ofthe related zero stop with its totaling stop.

4. In an adding machine, the combination with an accumulator comprisingwheels provided with zero stops and crawl tens transfer gearing betweensaid wheels, differential actuators including each a power element andprimary and secondary elements complementally driven thereby, eachprimary element having operating connection with an accumulator wheel,and driving means adapted to operate all of the power elementssimultaneously; of means cooperating with the accumulator, actuators,and driving means to take a total, including a total key, totaling stopsyieldably adjustable into the paths of movement of the zero stops,devices controlled by the total key and operable to adjust the totalingstops and cooperating members controlled by the total key and operableupon interruption of said adjustment by engagement of any totaling stopswith the peripheral faces of the related zero stops to move said primaryelements to counteract partial tens transfers in the accumulator, andmeans including extensions of said members cooperating with said devicesto lock the controlled by the total stop andthe 5. In an adding machine,the combinationa with an accumulator comprising wheels provided withnotched disks having stop shoulders adjacent the notches and crawl tenstransfer gearing between said wheels, difierential actuators includingeach a power element and primary and secondary elements complementallydriven thereby, each primary element having operating connection with anaccumulator wheel, and driving means adapted to operate all of the powerelements simultaneously; of means cooperating with, the accumulator,actuators and driving means to take a total, including a total key,totaling stops yieldably adjustable into the paths or movement of thestop shoulders, devices controlled by the total key and operable toadjust the totaling stops, and cooperating members key and operable uponinterruption of said adjustment by engagement of any totaling stops withthe peripheral faces of the related accumulator disk to move saidprimary elements to counteract partial tens transfers in theaccumulator, and means including extensions of said members cooperatingwith sai devices to lock the secondary actuator elements againstoperation by the driving means and each operable upon movement of therelated totaling stop into the notch of its disk to release thesecondary element.

6. In an adding machine having an accumulator comprising wheelsprovided. with zero stops and crawl tens transfer gearing between saidwheels, differential actuators tor said wheels, and driving means forsaid actuators; means cooperating with the accumulator and actuators totake a total, including totaling stops adjust able into the paths ofmovement or the zero stops,

cooperating members operable upon interruption of said adjustment byengagement of any totaling stops with theperipheral faces of the relatedzero stops to move the actuators to counter-act partial tens transfersin the accumulator, a total key, and means operable by said key independently of the drive means to adjust each totaling stop and itscooperating member seriatim to align the numeral wheels successively,from lower to higher order, said driving means being operable to movethe actuators simultaneously to complete the movement of the wheels tozero.

'7. In an adding machine having an accumulator comprising a series ofwheels connected by crawl tens transfer gearing. and diflerentialactuators each including a power element and primary and secondaryelements complementally driven thereby and provided with normal posi-=tion locators each primary element having operating connection with anaccumulator wheel;

snail cams each connected to an accumulator into contact with saidwheel, stops movable cams, connections between each stop and thedifierential actuator and the secondary element normal position locatorof inext higher order, and means for operating said connectionsindependently oi the power elements to disable said locators and impartto each differential actuator a movement limited by the lower ordersnail cam.

8. In an adding machine having an accumlatqr comprising a series ofwheels connected by crawl tens transier gearing, and differentialactuators tor said accumulator; snail cams each connected to anaccumulator wheel, stops movable into contact with said cams, leverseach ensageable with a diflerential actuator, connections between eachlever related to the diilerential u actuator of next higher. order andincluding means for differentially operating the stops and levers, andmeans for operating said connections to impart to each difierentialactuator a movement limited by the lower order snail cam.

9. In an adding machine having an accumulator comprising a series ofwheels connected by crawl tens transfer gearing, and differentialactuators for said accumulator; snail cams each connected to anaccumulator wheel, stops movable into contact with said cams, leverseach engageable with a differential actuator, connections between eachstop and the lever related to the difierential actuator of next higherorder and including means operable to cam the stops and leversdifierentially, and means for operating said connections to impart toeach differential actuator a movement limited by the lower order snailcam.

10. In an adding machine having an accumulator comprising a series ofwheels connected by crawl tens transfer gearing, and difierentialactuators for said accumulator; snail cams each connected to anaccumulator wheel, stops movable into contact with said cams, leverseach engageable with a differential actuator, connections between eachstop and the lever related to the diflerential actuator of next higherorder, operable to impart complemental movements to each stop'and itsrelated lever, and means for operating said connections successively toimpart to actuators of successively higher order movements limited bythe lower order snail cams.

11. In an adding machine, the combination with an accumulator comprisingwheels provided with zero stops and crawl tens transfer gearing betweensaid wheels, differential actuators including each a power element andprimary and secondary elements complementally driven thereby andprovided with normal position locators, each primary element havingoperating connection with an accumulator wheel, and driving meansadapted to operate all of the power elements simultaneously; of meanscooperating with the actuators and driving means to set the accumulatorwheels to zero registering position, including stops adjustable intomovement of the zero stops, and means operable to disable certain of thenormal position locators to allow abnormal movement of the relatedactuator elements and to control the extent of movement of the secondaryactuator elements.

12. In an adding machine, the combination with an accumulator comprisingwheels provided with zero stops, difierential actuators including each apower element and primary and secondary elements complementally driventhereby, each primary element having operating connection with anaccumulator wheel, and driving means adapted to operate all of the powerelements simultaneously; of means cooperating with the actuators anddriving means to set the accumulator wheels to zero registeringposition, including actuator stopping devices comprising each a primaryelement adjustable into the path of movement of the related zero stopand a-secondary element adjustable into the path of movement of therelated secondary actuator element, and connections operable to adjustthe primary and secondary stop eimnents complementally and to permitmovement thereof in unison upon contact or the related zero stop withits primary stopping element.

GEORGE 0. cm.

the paths 0!

